Wastewater Treatment (STP) Calculator
Static · formula-only · worked example computed when this page was built · no live data
The Wastewater Treatment (STP) Calculator finds the design flow, BOD load, and aeration tank volume for a sewage treatment plant. Example: for a 500-person facility at 120 L/person/day, BOD 250→30 mg/L, Design flow = 60 m³/day, BOD load = 15 kg/day, BOD removal = 88 %, Aeration volume = 17.9 m³ (per DENR DAO 2016-08).
How it works
Computed from your inputs per DENR DAO 2016-08. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Plumbing & Pumps)
Inputs: a 500-person facility at 120 L/person/day, BOD 250→30 mg/L.
| Result | Value |
|---|---|
| Design flow | 60 m³/day |
| BOD load | 15 kg/day |
| BOD removal | 88 % |
| Aeration volume | 17.9 m³ |
Computed by WorkHive's calculation engine when this page was built; standard: DENR DAO 2016-08.
How to use this calculator
- Read the worked example. It uses a 500-person facility at 120 L/person/day, BOD 250→30 mg/L and shows every number in the method.
- Follow the formula with your own figures: it returns Design flow, BOD load, BOD removal, Aeration volume, computed per DENR DAO 2016-08.
- To compute interactively, open the Wastewater Treatment (STP) Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a sewage treatment plant sizing calculator BOD?
The Wastewater Treatment (STP) Calculator is a free online tool that finds the design flow, BOD load, and aeration tank volume for a sewage treatment plant. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following DENR DAO 2016-08. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Wastewater Treatment (STP) Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.